10
votes
Accepted
SFP+ transceiver's ability to do 1GbE
Short answer: in theory yes, in practice no.
Long answer:
There are SFP+ optics which can also work at 1 GbE, I've talked (sorry, no other source than that) to people who were experimenting with it ...
- 186
7
votes
Accepted
Can a pair of matching WDM transceivers be connected directly?
Mutiplexers arrange multiple wavelengths onto a shared fiber - they don't change the signals. So yes, if the transmitter/receiver wavelengths match you can connect two transceivers with standard patch ...
- 82.8k
5
votes
SFP-10G-LRM compatible with Single Mode Fiber?
It can use multimode, but it doesn't have to:
The Cisco 10GBASE-LRM Module also supports link lengths of 300m on
standard Single-Mode Fiber (SMF, G.652).
From the data sheet.
- 67.1k
5
votes
Accepted
What certifications are there for Fiber Optic termination and splicing?
It's not terribly difficult to train yourself, if you care about the doing. If you care about selling yourself more, BICSI will happily take your money as a certifier. Probably better if you can get ...
- 2,746
5
votes
Accepted
10G SFP+ transceiver with OM4 fiber cable - Maximum cable length?
If you have not already bought and installed the cable then you should install single mode fiber instead and use LR transcievers. This is the officially supported way to do links of that distance at ...
- 13.2k
4
votes
detect SFP transmit wavelength
Relying on SFP MSA is not a good options, as these specs are often faked to allow a specific switch to work with an incompatible device (I've see lots of bidirectionnal SFP which are identified as ...
- 427
4
votes
Accepted
Optical fibers out of service
does a bad equipment or a too high signal could break an optical fiber silica
Not likely. To actually damage the fiber, you'd need very high transmit power (several Watt) not common with off-the-...
- 82.8k
4
votes
What is the difference between LR1 and LR4 optics?
As in 10GBASE-LR versus 40GBASE-LR4?
-L stands for long ~1300 nm wavelength (as opposed to -S for 850 nm and -E for ~1550 nm). -R stands for large block code 64b/66b.
The suffix 4 stands for the ...
- 82.8k
3
votes
Macsec and Optics
Assuming you're talking about fiber optic transceivers commonly used in network equipment, the answer is MACsec has no impact on them. MACsec is a layer 2 protocol, while transceivers are simply ...
- 67.1k
3
votes
Accepted
Power at the terminals of a PLC fiber optic splitter
Here is an answer I found at the web site of a fiber optics manufacturer
A common question we receive is whether a 50/50 beamsplitter can be used in reverse, to combine the
signals ...
- 59
3
votes
Accepted
Doubt about MMF and SMF speed
As the name implies a multi mode fibre can carry multiple modes of light. This is not the same thing as multiple signals.
The multiple modes of the same signal only leads to modal dispersion which ...
- 1,076
3
votes
Accepted
How many 3 dB couplers are needed to construct a 16 way fiber optic splitter?
Follow the math in the wiki article: (2^4)-1=15.
- 98.8k
3
votes
Accepted
Why do higher speed links require a stronger signal?
You can visualize a high-speed pulse signal by using an eye pattern. The "eye" opening is the measure of distinction between levels (vertical) and pulse sequence (horizontal). The larger the ...
- 82.8k
3
votes
Accepted
SFP+ 10GBASE-LR and attenuator
Most 10 km PHYs can talk to each other even over very short links.
The key is whether the max launch power overshoots the max receive power, effectively blinding the receiver.
With this transceiver, ...
- 82.8k
2
votes
detect SFP transmit wavelength
Anything that conforms to the SFP MSA ("specs") has an I2C interface to a PROM with those values stored within it. I have yet to see an SFP (or SFP+) that did not have that interface.
- 31.8k
2
votes
What certifications are there for Fiber Optic termination and splicing?
The standards body, which also provides training and certifications, is BICSI. You must join BICSI. There are then classes, some offered by BICSI, some offered by approved third parties. You take ...
- 98.8k
2
votes
Accepted
Latency of AOC vs passive DAC
The difference here is incredibly trivial - literally on the order of single-digit nanoseconds. The amount of time it takes to get the packet organized and across the switch is likely 2- to 3- orders ...
- 6,104
2
votes
Accepted
What is the purpose of defect limit in Zone D in criteria for MM‐PC Connectors (IEC 61300‐3‐35)
Not all defects are negative. Any protruding defect, or loose contaminant particle, can prevent contact (holding the connector faces apart), scratch the mating connector, or in the case of a loose ...
- 2,746
2
votes
Accepted
Power Budget Based on Miniums?
4.5 dB is the maximum loss where it's still guaranteed to work. Of course, it will likely be better, but as they say, your mileage may vary.
- 67.1k
2
votes
Do low temperatures cause problems installing new optical wiring or fixing broken optical cables by splicing?
In addition to the excellent answer by user36472: I know that some of our contractors refuse to do ground works when temperatures are below 0 degrees celsius, since digging up fibers in frozen ground ...
- 17.1k
2
votes
Accepted
Using XFP-10G (120 KM Range) on Juniper MX routers
When we run the command 'show chassis hardware' , there is no such mentioning that its a NON-JNPR XFP. Based on this , can we say confidently that it must be XFP from Juniper side?
The thing you're ...
- 7,044
2
votes
SFP+ 10GBASE-LR and attenuator
Launch power max 0.5 dBm, receive power max 0.5 dBm. Should be fine. Also, -8.2 to 0.5 dBm is a huge range for launch power, although this may be specified with aging in mind (launch power reduces ...
- 493
2
votes
Accepted
Is there a difference between BIDI LR and DFB BiD or are they compatible?
25GBASE-BR is standardized in IEEE 802.3cp-2021.
There are quite a few pre-standard transceivers out there (BiDi, BX, ...) but pretty much all of them use the same 1270/1330 nm wavelength pair that ...
- 82.8k
2
votes
Accepted
Single-Mode Fiber Optics
You can verify your assumption by looking at the offers at the vendor of your choosing.
Traditionally, SMF optics used to be a lot more expensive than MMF ones due to the laser/detector technologies ...
- 82.8k
2
votes
How can GMPLS unify signalization plain of all telecommunications network technologies?
The idea of GMPLS is that it's hardware and media agnostic. Optical networks are just one kind of media that GMPLS can be used on.
- 67.1k
2
votes
Accepted
Can wrong SFP module damage equipment?
No, not normally.
By design, all SFP/SFP+/SFP28/... modules are electrically compatible. The maximum power-supply current defined by the SFF standards is 500 mA.
All signal contacts are well defined ...
- 82.8k
1
vote
Do low temperatures cause problems installing new optical wiring or fixing broken optical cables by splicing?
In Finland we do installs also in winter. If the ground is frozen, it can be hard to dig, but also other cables may be in danger too. We do some splicing outdoors with home drop cables. Most of the ...
- 11
1
vote
Optical fibers out of service
Hopefully I'm understanding the question correctly. If you're asking if bad optics, or an optic shooting light thats too hot (high transmit dbm) can damage the core in the fiber cable itself; then no. ...
- 140
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